Monitor for digging coal

ABSTRACT

The present invention relates to a monitor used in coal mines for digging coal. The impact of pressured water against a coal face through the nozzle of the monitor effects the coal digging operation. In working the coal face, coal thrown out from the coal face will clash against the monitor, and falling coal lumps will bury the monitor thus decreasing the efficiency of coal digging operation, and the known type of monitor has suffered damage from such severe conditions. According to the present invention, the above impediment has been for the most part eliminated by virtue of the novel constructions wherein the cylinder for raising and lowering the nozzle of the monitor is mounted just behind the monitor while the unit for turning the nozzle of the monitor is disposed under main water supply pipe and is received and closed in a housing. This construction has further advantages in that the full height of the monitor is markedly decreased and in that the stability thereof is greatly increased.

United States Patent [191 Yamamoto [11] 3,809,318 May 7,1974

[ MONITOR FOR DIGGING COAL [75] Inventor: Masami Yamamoto, Tokyo, Japan[73] Assignees: Mitsui Mining Company, Limited;

Nihom Kikai Kogiyo Co., Ltd., both of Tokyo, Japan [22 Filed: Oct. 31,1972 [21] Appl. No.: 302,503

[30] Foreign Application Priority Data Nov. 12, 1971 Japan 46-90435 [51]Int. Cl. E210 45/00 [58] Field of Search 239/587, 273, 288; 169/25;299/16, 17; 175/422 [56] References Cited UNITED STATES PATENTS 803,58711/1905 Hanford 299/17 2,698,664 l/1955 Freeman 239/587 X 965,709 7/1910Hart 4. 239/587 X 2,111,553 3/1938 Chew 239/587 X FOREIGN PATENTS ORAPPLICATlONS 176,543 11/1965 U.S.S.R 299/17 14 egg! 4 Primary ExaminerM.Henson Wood, Jr. Assistant Examiner-Andres Kashnikow Attorney, Agent, orFirm-Wenderoth, Lind & Ponack 57] ABSTRACT The present invention relatesto a monitor used in coal mines for digging coal. The impact ofpressured water against a coal face through the nozzle of the monitoreffects the coal digging operationQln working the coal face, coal thrownout from the coal face will clash against the monitor, and falling coallumps will bury the monitor thus decreasing the efficiency of coaldigging operation, and the known type of monitor has suffered damagefrom such severe conditions. According to the present invention, theabove impediment has been for the most part eliminated by virtue of thenovel constructions wherein the cylinder for raising and lowering thenozzle of the monitor is mounted just behind the monitor while the unitfor turning the nozzle of the monitor is disposed under main watersupply pipe and is received and closed in a housing. This constructionhas further advantages in that the full height of the monitor ismarkedly decreased and in that the stability thereof is greatlyincreased.

4 Claims, 4 Drawing Figures PAIENIEUIAY 1 1914 3,809,318

SHEET 1 OF 2 MONITOR FOR DIGGING COAL of which are free from theimpediments likely to arise under the severe conditions met in working acoal face such as impact of thrown coal and being buried under coallumps.

A monitor used in a coal mine for digging coal should be constructed asstrongly as possible so as to hold up under bad conditions encounteredin carrying out coal digging operations. For example, the impact givento the monitor by coal thrown from the coal face will cause damage tothe monitor and the falling coal lumps will bury the lower half of themonitor thus hindering prearranged coal digging performance.

Since the conditions for digging coal are as above, it is desirable todispose the members for effecting handling of the monitor in a positionprotected from the impact of coal, and it is also desirable to minimizethe exposure of movable members in the monitor to prevent hindrance orstoppage of work due to the falling coal lumps. Nevertheless, theconstruction of known monitors for digging coal was such that the waterpressure cylinder for raising and lowering the nozzle was disposed infront of the monitor and the top of the piston-rod of the water pressurecylinder for turning the monitor was connected to the arm projectingfrom the outer surface of the lower portion of the monitor. As aninevitable consequence, the movable members for handling the monitorwere apt to suffer damage from theimpact of scattered coal and from themass of falling coal lumps, and this has decreased the efficiency of thecoal mining operation.

According to the present invention the above said defects of theconventional monitor are for the most part eliminated by virtue of thecharacteristic feature thereof wherein the cylinder for raising andlowering the nozzle is provided behind the monitor body while theturning device of the monitor is composed of an assembled rack andpinion, said rack being connected to a piston-rod movable in thecylinder for turning the monitor, said cylinder for turning the monitorbeing disposed under a main water supply pipe, and said movable membersbeing received and closed in a housing.

The characteristic aspects of the present invention will be explainedhereinbelow in detail with reference to the attached drawings wherein:

FIG. 1 is a side plan view showing the example of the monitor fordigging coal according to the present invention.

FIG. 2 is a top plan view of the monitor of FIG. 1.

FIG. 3 is an enlarged elevational view taken on line III-III OF FIG. 1.

FIG. 4 is a sectional view taken on line IV-IV of FIG. 3.

The monitor according to the present invention comprises a barge-likebase plate 1, base frames 2 received in and fixed to said plate 1, amain water-supply pipe having a swivel means therein, a holding means orgripping means 4 which constitutes the joint of said water supply pipe3, the lower end of the holding means being firmly secured to the baseframes 2. The monitor according to the present invention furthercomprises a tubular member 5 closed at the bottom thereof and rotatablyinserted into the holding means 4, a circular water passage 6 formedbetween the holding means 4 and the tubular member 5, openings 7 boredin the wall of the tubular member 5 for passing water therethrough, atwo-way water supply pipe 8 having swivel means which are mounted on theupper end of the tubular -member 5, holding means 9, 9 which serve asjoint means, a base tube 10 for mounting a projected delivery pipethereon, both of the end portions of the base tube 10 being rotatablyinserted in the holding means 9, 9, annular water passages 11, openings12 for passing water therethrough and a nozzle 14.

Water under pressure supplied to the main water supply pipe 3 runs intothe tubular member 5 through the circular water passage 6 and theopenings 7, is split in the two-way pipe 8, after which the waterstreams meet again at the exit of the base tube 10 through the openingsl2 and finally spurt out from the nozzle 14 via the projected deliverypipe 13, thus making it possible to dig coal from a coal face by meansof the impact given by the pressured water.

As shown in FIGS. 1 and 2, the monitor according to the presentinvention has an arm 15 protruding rearwardly from the center of thebase tube 10 and support arm 16, 16 correspondingly protruding from thelower part of the two-way water supply pipe 8. A cylinder 17 for raisingand lowering the nozzle 14 is pivotally engaged with the support armsl6, 16 by means of two shafts 18, 18 oppositely fitted to the lower partthereof, and the top of the piston rod 19 is pivotally connected to thearm 15 by means of a pin 20. By virtue of the above mentionedconstruction, the cylinder 17 for raising and lowering the nozzle can bedisposed behind the body of the monitor.

In FIGS. 3 and 4, the device for turning the nozzle of the monitor isillustrated. Numeral 21 indicates a fixed shaft located at the center ofthe bottom of the tubular member 5. A pinion 22 is mounted on the shaft21. A rack 23 engages with the pinion 22 and one of the end portions ofthe rack 23 is connected by means of a pin 26 to the top of a piston rodreceived in a cylinder 29. The cylinder 29 is secured to the base frame2 and serves to turn the nozzle through the movement of the piston rod25.

As seen in FIG. 4, the movable members for turning the nozzle arereceived in and covered by housing members 27, 28 both of which aresecured to the bottom of the holding member 4. Numerals 30, 30 indicatepacking means.

As is explained above, the cylinder for raising and lowering the nozzleof the monitor with the movable members having relation to the cylinder17 are hidden behind the body of the monitor, and this brings about animportant advantage in that the cylinder for raising and lowering thenozzle and the movable members related thereto are protected from theimpact of coal lumps thrown out during coal digging operation. Further,since the members movable relative to the cylinder for turning thenozzle are received in and surrounded by the housing member disposed atthe lower part of the monitor body, the possibility of falling coallumps impeding operation is completely eliminated.

The main water supply pipe according to the present invention is of theswivel type, and the members for regulating the turning motion of thenozzle, that is, the assembly of pinion, rack, piston rod and cylinder,are

3 disposed under the swivel. So, the full height of the monitor ismarkedly less, than that of prior art devices and the stability thereofis greatly improved. These further advantages obtained by the presentinvention also increase the efficiency in coal digging operation.

While there has been described what is at present considered to be thepreferred embodiment of the invention, it will be understood thatvarious modifications may be made therein and it is intended that theclaims include all such modifications as fall within the true spirit andscope of the invention.

What we claim is: g

l. A monitor fordigging coal comprising a barge-like base plate, a mainwater supply pipe secured to said base plate, a tubular member rotatablyheld by said main water supply pipe, a two-way pipe having two tops andone bottom mounted on said tubular member, a pivotal nozzle memberoperably connected to said two way pipe and including a nozzle, a firstwater pressure cylinder for raising and lowering the nozzle of themonitor, said first cylinder being mounted behind said twoway pipe, ashaft projecting downwardly from the bottom of said tubular member, apinion mounted on said shaft, a rack which engages with. said pinion, asecond cylinder having a piston-rod received therein said rack beingconnected to said piston-rod for turning the nozzle of the monitor in ahorizontal plane, said shaft and rack and the second cylinder beingreceived in and tightly surrounded by a housing member secured to thebottom of a holding member which grasps said tubular member held by saidwater supply pipe.

2. A monitor for digging coal as set forth in claim 1 wherein the nozzleof the monitors is connected to said two-way pipe be means ofa base tubewhich has an exit at the center of the length thereof and holding meansconnected to each of the tops of said two-way pipes and I said base tubefor rotatably supporting said base tube,

said exit communicating with the nozzle of the monitor.

3. A monitor for digging coal as set forth in claim 1 wherein the firstcylinder for raising and lowering the nozzle of the monitor is supportedby two arms which using swivels in each of the holding means.

1. A monitor for digging coal comprising a barge-like base plate, a mainwater supply pipe secured to said base plate, a tubular member rotatablyheld by said main water supply pipe, a two-way pipe having two tops andone bottom mounted on said tubular member, a pivotal nozzle memberoperably connected to said two way pipe and including a nozzle, a firstwater pressure cylinder for raising and lowering the nozzle of themonitor, said first cylinder being mounted behind said two-way pipe, ashaft projecting downwardly from the bottom of said tubular member, apinion mounted on said shaft, a rack which engages with said pinion, asecond cylinder having a piston-rod received therein said rack beingconnected to said piston-rod for turning the nozzle of the monitor in ahorizontal plane, said shaft and rack and the second cylinder beingreceived in and tightly surrounded by a housing member secured to thebottom of a holding member which grasps said tubular member held by saidwater supply pipe.
 2. A monitor for digging coal as set forth in claim 1wherein the nozzle of the monitors is connected to said two-way pipe bemeans of a base tube which has an exit at the center of the lengththereof and holding means connected to each of the tops of said two-waypipes and said base tube for rotatably supporting said base tube, saidexit communicating with the nozzle of the monitor.
 3. A monitor fordigging coal as set forth in claim 1 wherein the first cylinder forraising and lowering the nozzle of the monitor is supported by two armswhich protrude rearwardly, one of said arms being secured to said basetube the other being secured to the lower part of said two-way pipe. 4.A monitor for digging coal as set forth in claim 1 wherein the ejectionof water can be carried out throughout the operation of handling thenozzle by using swivels in each of the holding means.